Assigffob to



(No Model.)

B. L. OONKEY.

\ CENTER BEST FOR LATHBS.

Patented Sept. 18, 1883.

Lithographer, wuhin m. D, c.

UNITED STATES PATENT, OFFICE.

EDWARD L. coEKEY,'oE BOSTON, MASSACHUSETTS, ASSIGNOR T0 CHARLES ALBERTSHAW, 0E SAME PLACE.

CENTER-REST FOR LATHESI SPECIFICATION forming part of Letters Patent No.285,115, dated September 18, 1883.

Application filed February 26, 1883. (No model.)

To all whom it may concern.-

Be it known that I, EDWARD L. CONKEY, of Boston, in the county ofSuffolk and State of Massachusetts, have invented a certain new anduseful Improvement in Center-Rests or Chucks for Lathes, of which thefollowing is a description sufficiently full, clear, and exact, toenable any person skilled in the art or science to which said inventionappertains to make and use the same, reference being had to theaccompanying drawings, forming a part of this specification, in whichFigure 1 is a frontelevation, and Fig. 2 a vertical transverse section.taken on the line 00 00, Fig. 1.

Like letters of reference indicate corresponding parts in the differentfigures of the drawings. My invention relates to that class ofcenterrests which are provided with means for centering or chucking theWork; and it consists in a novel construction and arrangement of theparts, as hereinafter more fully set forth and claimed, by which asimpler and more effective device of this character is produced than isnow in ordinary use.

The nature and operation of the improvement will be readily understoodby the follow ing explanation.

In the drawings, A represents the collar or annular support, and B thebed-piece, these parts being preferably cast integral, or in one piece.A round sleeve, 0, provided wit-h the annular flange F, is fitted towork nicely in a corresponding horizontal hole through the collar A, thesleeve being formed with the bearing d, and preferably held in positionin the collar by the annular plate D and screw-bolts Arranged radiallyin the flange Fthere are a series of set-screws, H, preferably four innumber, for securing and centering the work, the rest being adjustablyattached tothe shears or bed of the lathe by the bolt G, which passesthrough a hole, m, in the bed 13, and is secured by the nut a, the lowerend of the bolt being attached to a clamp or secured in any suitablemanner.

In the use of my improvement the shaft, pipe, or other article to beturned, threaded, cut, or otherwise operated on is simply passed throughthe sleeve and centered by the screws H, the screws being turned insufficiently to firmly secure the work in the rest. I do not, however,wish to be understood as confining myself to placing thecentering-screws in the flange F, as they may be inserted in the plateD, if preferred, and perform substantially the same functions. It willbe obvious that when used as a center-rest no spotting is required onpieces of irregular shape, and that finished work will not be injured byrunning in it. It holds the work firmly to the headstock center of thelathe, and at the same time permits it to revolve as perfectly as whenrunning on the ordinary centers.

The improvement is especially useful for cutting off and threading'pipe,cutting off, centering, turning, and finishing up the ends of shafting,fitting up flange-pipe, iron columns,

boring lathe-spindles, cutting inside and out side screw-threads,finishing the ends of rollers, 850.

Having thus explained my invention, what I claim is- In a devicesubstantially such as described, the combination of the collar A,annular plate D, and sleeve 0, the sleeve having the bearing 01 andflange F, said flange being provided with means for centering the work,substantially as specifiedf EDVARD L. CONKEY.

Witnesses: H. E. METCALE,

L. J. WHITE.

